【上位】 hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent" （努力、計画または欲求）邪魔する、妨げる。
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【下位】 disappoint, prove undependable to; abandon, forsake; "His sense of smell failed him this time"; "His strength finally failed him"; "His children failed him in the crisis" 失望させ頼れないことを証明する。捨て、見捨てる。
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